| http://www.w3.org/ns/prov#value | - In the vessel on the left, a strong bar magnet floats on end in a mercury bath, held in place only by a thread at its bottom. (Recall that mercury is a heavy, liquid, and metallic element that is a very good conductor of electricity.) A fixed copper wire dips into the mercury at the top of the bath; at the bottom of the vessel, another wire also projects into the mercury.
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